对于下列的两个剪应力计算公式: 1τ=T/2πR 2 t 和 2τ=Tρ/I P ,下列结论中是正确的是 。
A.
①只适用于各种空心圆轴,②既适用于各种空心圆轴,也适用于实心圆轴;
B.
对于空心薄壁圆管 ①、②虽然形式不同,但描述的剪应力的分布规律是完全相同的;
C.
①式仅利用平衡条件导出,②式曾利用平面假设和平衡条件;
D.
①、②两式均根据平面假设导出。
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